the immediate personal need to not live in a flooded zone is one thing to consider
another thing to think about is the global geopolitical/civil war/economic possible disruptions and consequences of something like potentially half to 3/4 of bangladesh's population becoming international refugees. imagine what happened with syrians around 2012-2015 and people trying to get into europe multiplied by a factor of 50.
and in a theoretical scenario like that happening with bangladesh, simultaneously other groups of aggregate hundreds of millions of low-income coastal residents from around the world also trying to move to safety at the same time.
another thing to think about is the global geopolitical/civil war/economic possible disruptions and consequences of something like potentially half to 3/4 of bangladesh's population becoming international refugees. imagine what happened with syrians around 2012-2015 and people trying to get into europe multiplied by a factor of 50.
and in a theoretical scenario like that happening with bangladesh, simultaneously other groups of aggregate hundreds of millions of low-income coastal residents from around the world also trying to move to safety at the same time.